/**
 * Copyright (C) 2010-2016 eBusiness Information, Excilys Group
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed To in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.ohosannotations.logger;

import java.util.HashMap;
import java.util.Map;

/**
 * Log日志工厂
 *
 * @since 2021-07-19
 */
public final class LoggerFactory {
    private static final Map<String, Logger> LOGGER_CACHE = new HashMap<>();

    private LoggerFactory() {
    }

    /**
     * 获取Log
     *
     * @param clazz 类字节码
     * @return Logger Log
     */
    public static Logger getLogger(Class<?> clazz) {
        return getLogger(simpleLoggerName(clazz));
    }

    private static Logger getLogger(String name) {
        if (name == null) {
            throw new IllegalArgumentException("name argument cannot be null");
        }

        Logger logger = LOGGER_CACHE.get(name);
        if (logger == null) {
            logger = new Logger(LoggerContext.getInstance(), name);
            LOGGER_CACHE.put(name, logger);
        }

        return logger;
    }

    private static String simpleLoggerName(Class<?> clazz) {
        Package classPackage = clazz.getPackage();
        if (classPackage == null) {
            return clazz.getName();
        }

        StringBuilder stringBuilder = new StringBuilder();

        String packageName = classPackage.getName();
        int lastIndex = 0;
        while (true) {
            stringBuilder.append(packageName.charAt(lastIndex)).append(".");

            lastIndex = packageName.indexOf('.', lastIndex);
            if (lastIndex == -1) {
                break;
            }
            lastIndex++;
        }

        stringBuilder.append(clazz.getSimpleName());

        return stringBuilder.toString();
    }
}
